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Yarrow is a quite common plant in late spring, 1-2' tall. The stem is unbranched until just below the flat or dome-shaped flower mass (which can be 2-4" across). Individual flowers are ~1/4" across with 5 white to cream colored ray florets (rarely pink or rose), shallowly notched at the tips, and 10-20 cream to pale-yellowish disc florets. The most recognizable feature of yarrow is the finely-divided, feathery or fern-like leaves, permitting a confident ID even when the plant is not in bloom.

Achillea

Achillea millefolium

yarrow [Blooms: May-Jun]